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26th November 2011, 09:37 PM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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It's likely an NJM4580D. They rarely fail if this is one of the clone amps.
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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26th November 2011, 09:40 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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These rarely need anything more than replacing Q124 and Q125. If you have the DVD, read the Generic Class D - Type 2 page.
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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27th November 2011, 12:24 AM
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#5 |
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diyAudio Member
Join Date: Jan 2010
Location: memphis tn
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ok. i got the amp working. i pulled out the old power bass to to compare some reading since its the same amp. i came across an ic.kia393p that receiving 50v. the max is 18-36. could that have been the issue?
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27th November 2011, 12:49 AM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The 393 is likely on the negative rail. Measure the DC voltage with the black probe on pin 4 and the red probe on pin 8.
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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27th November 2011, 12:57 AM
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#8 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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How can you have two voltages with the probes on the points as described?
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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27th November 2011, 02:58 AM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Did you place the black probe on pin 4 of the IC that you were measuring the voltage on?
Which one had 25v?
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Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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